1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Copyright (C) 2013 Vicente Botet
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
////////////////////////////////////////////
//#define BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN
#include <boost/thread/thread_only.hpp>
#include <boost/thread/shared_mutex.hpp>
using namespace boost;
shared_mutex mtx;
const int max_count = 100;
void f()
{
int count =max_count;
while (count--)
{
upgrade_lock<shared_mutex> lock(mtx);
}
}
void g()
{
int count =max_count;
while (count--)
{
shared_lock<shared_mutex> lock(mtx);
}
}
void h()
{
int count =max_count;
while (count--)
{
unique_lock<shared_mutex> lock(mtx);
}
}
int main()
{
thread t0(f);
thread t1(g);
thread t2(h);
t0.join();
t1.join();
t2.join();
return 0;
}
|
